Apparatus for actuating the cores of a die casting machine



June 14, 1932. A. P. ROSANDER ET AL APPARATUS FOR ACTUATING THE CORES OF A DIE CASTING MACHINE 2 Sheets-Sheet 1 Filed Feb. 15. 1930 mrafi'fa/s A fiam/ma/ ff WXfd/sry 47% 47,57

June 1932- A. P. ROSANDER ET AL 5 APPARATUS FOR ACTUATING THE CORES OF A DIE CASTING HACZ'XINE Filed Feb. 15, 1930 2 Sheets-Sheet 2 VII/f0 r 4. I v f Patented June 14, 1932' ALBERT P. ROSANDER, OFEQREST PARK, AND FRANCIS I. TIKALSKY, OF LA GRANGE,

UNITED srATEs PATENT OFF-ICE ILLINQIS, ASSIGN'ORS T WESTERN ELECTRIC COMPANY,-INCOBPOBATED, OF NEW YORK, n.1, a oonroaa'rron or NEW YORK arraaarus roa acrrrra'rnve ran corms or a ma cas'r'mo 'mcrmm a ucauon filed February aieao. Serial no. 428,558.

This invention relates touapparatus for actuating the cores of a die casting machine, and more particularly to a hydraulically actuated attachment for die casting appa- (3 ratus to separate the cores thereof from the the cast articles.

. tudinal movement of the cores.

cast metal parts.

' An object of this invention is to provide simple and efiicient apparatus for withdrawing the cores of a die casting machine from In accordance with this object, one embodiment of the invention comprises a die section having cores slidablymountedin the casting cavities thereof, portions of the cores being shouldered and confined within recesses of the die section for limiting the longi- Bearing members are mounted within; the central portions of the die section for receiving the inner ends of levers which extend through apertures in the cores and to thelateral edges of the die section. A plurality of hydraulically operated plungers are mounted adjacent to the lateral edges of the die section and connected to the outer extremities of the levers for actuating the cores to withdraw them from the cast metal parts.

A clear understanding of the invention will be had from the following description of one specific embodiment thereof when taken in connection with the accompanying drawings, wherein Fig. 1 is a perspective view of a stationary die section and the hydraulic piston structure for actuating the cores thereof;

Fig. 2 is a longitudinal cross-sectional view of the pistons and die section taken through a pair of the cores thereof, and

Fig. 8 is a central cross-sectional view of a telephone transmitter shell which is one of the cast parts in connection with which the core actuating structure is adapted for use.

Referring now to the drawings in which like reference numerals designate similar parts throughout the several views, there is disclosed a rectangular die shoe 5. and a stationary die section or die block 6 is shown secured thereto by means of countersunk bolts 7, and it is the purpose of this invention to provide an actuating structure for moving the cores 8 thereof to separate them from the cast, cooling metal as it starts to shrink.

The metals enters through a central aper ture or gate 9 and passes throu h channels: 10 into symmetrically positione casting cavities adjacent the cores 8. The cores 8 are constructed of metal or other suitable material and are slidably mounted within suitable apertures extending downwardly through the diehalf or block 6, andthe loweror outer extremities of the cores 8 have shoulders 11 which are confined within recesses 12 formed in the lower portion of the diehalf or section 6 and the upper art of the die shoe 5 for limiting the longitu inal movement of 'the cores. In the specific embodiment shown, the cores 8 and the surrounding casting cavities are shaped to mold the lower or larger flanged portion of a telephone transmitter shell 13 (Fig. 3), although the invention may of course be applied to the casting of parts of various shapes. The cores are slidably mounted within the diehalf so that they may be moved or withdrawn from the casting 13 when the cast metal starts to cool and shrink. A pair of transverse slots 14, only one-of which appears in Fig. 2, are provided in the lower portion of the diehalf 6 extending between the lateral edges thereof and through the foremost and the farthermost pairs of cores 8. I

Since the mechanisms associated with each of the slots 14 are identical, only one such mechanism will be described. A bearing member 15 is positioned within each slot 14 in the central portion of the diehalf and between the cores 8, the member being secured therein by means of a set screw 16. A pair of rectangular levers or connecting rods 19 provided with rounded inner ends which are pivotally mounted in the bearing member 15 extend outwardly through the die block slot 14 through beveled apertures 20 provided in the cores 8. Member 15 is provided with upper and lower rounded projections 17 and 18. respectively, against which the inner ends of levers 19 bear in rolling contact when the levers are actuated.

A plurality of cylindrical guide blocks 23 cesses 46 provide of pipes 38. and 39 which lead to a four-way plates 26 which serve as cylinder heads.

are secured by screws 24 to the die shoe 5 adjacent the lateral sides of the diehalf 6 and the outer ends of the levers 19, and on the upper ends of the guide blocks, cylinders 25 are secured by means of, bOltS'27 passing thropgh 1stons 28 are provided within the cylinders 25 and piston rods 29 with-crossheads 30-integra1 with the lower ends thereof are boltedto the. pistons 28. Wrist pins 31 connect the crosseads 30 with the levers 19, the guide blocks 23 having suitable lateralslots =21 aligned with the slots 14 to permit vertical movement of the levers 19.

The piston rods 29 areprovided with suitable packing material 32 which is adj ustably .housed within the upper ends of the guide blocks 23 by means of threaded bushings 33, slots 34 (Fig.1) being provided in the guide blocks to enable the operator to adjust these bushings by inserting a pin through the" slots 34 and into, enga ementfwith peripheral rein these bushings. I

Lowerandjupper conduits 35 and 36, res'pectively, extend into the upper and lower ends of each cylinder 25 to enable the pistons 28 and the metal cores 8 to be 0 erated in either direction by, means of flui pressure. As shownin Fig. 1 the conduits 35 and 36 are connected respectively to upper and lower sets valve 40 of any suitable construction for controlling the operation of the istons, this upwardly from the diehalf 6 to cooperate with corresponding recesses formed inthe the castings" otherdiehalf (not shown) when are being formed.

. In the operation of the above described ap paratus, a movable upper diehalf or die block (not shown) is brought down over. the guide pins 37 and into contact with the lower diealf 6, and the. molten metal is injected through the central gate 9 and into the chan-,

nels 10 and the casting cavities surrounding the die cores 8, which form the lower or larger portion of the: alumium telephone transmitter shell 13- (Fig. 3). As the cast metal starts tocool and shrink around the cores 8, oil or other suitable motive fluid is forced into the conduits 36b) moving'the hand lever 42 of the four-way valve iO about the fulcrum 43 as-aforedescribed, thus forcing the pistons 28 and the levers 19 downwardly,

time after theparts are cast, and it and the cores 8 will thereby be moved downwardl and away from and out of contact with t e cast parts 13, and separating each oi the cores 8 from the cast arts as theystart to cool and shrink. This escribed position of the mentioned parts is shown in Fig. 2 with the cast-parts 13 removed from the casting cavities.v ,In casethinpiece parts or castin s are being made,- which will cool relative y ;faster than heavy parts, thiscore actuating operation is set up in a comparatively short will be understood that the dimensions of the cast parts may ma considerable extent be controlled by the time of withdrawing the cores. By means of the above described manual control, the operation of the machine is made more flexible than in the case of core-pulling mechanism which is automatically operated at a predetermined time in the cycle of operation ofthe diecasting machine.

It will also be understood that the hydraulic pressure mechanism hereby provided serves to withdraw the cores smoothly and to move them approximately simultaneously, but if some of the cores stick or set up more resistance than others the pressure will in ,a short time'in'crease sufiiciently' on the pistonsactuating suchsti'cking cores to remove them shortly after the more easily actuated cores are withdrawn; .With the cores thus removed from the castparts, the parts are removed by withdrawing the upper diehalf (not shown) away from the 'de pins 37, and ejecting apparatus (not s own) is then \set in operatlonto remove the castings.

When the next set of transmitter parts is to be cast, oil under pressure is released into the ports 35 by moving the hand lever 42 downwardly as aforedescribedto move the pistons 28 and the cores 8 upwardly into position for receiving and formin the molten metal into the transmitter she Is 13, whereupon the upper diehalf is again brought down into engagement with the die block 6 to receive-another charge of metal, and thecasting process then goes on as aforedescribed. i

In case 'it' is'found that one of the cores 7 8 is raised b its corresponding piston to a position-.hig erthan its pro er castin position, a'shim 45 (Fig. 2)'may laced a ve the corresponding p1ston'28 to hmit the up;

ward movement of both, and thus it will understood that the casting position of any one of the pistons may be similarly adjusted with respect to the die plates.

From th'e foregoing description, it-is believed to be obvious that the hydraulic operating piston and'lever structure provided by this invention comprises an eflicient and simple apparatus for withdrawing the cores fromthecast parts. I

It is, of course,'tobe, understood that the invention is not to be limited to the specific embodiment herein described and illustrated, but is to be limited only by the scope of the annexed claims.

What is claimed is:

1. In a casting apparatus, a base, a mold part mounted thereon having a casting cavity, an apertured core reciprocably mounted Within the cavity, a lever extending through the aperture in the core and fulcrumed at one end within the base, and means operatively connected to the lever for moving it about its fulcrum to cause an inserting and retracting movement of the core relative to the casting cavity.

2. In a casting apparatus, a base, a mold part mounted thereon having a casting cavity, an apertured core reciprocably mounted Within the cavity, a lever extending through the aperture in the core with one end pivoted Within the base at one side of the core, the aperture in the core formed to permit a rocking motion of the lever therein, and means operatively connected to thevopposite end of the lever for moving the lever about its pivot to cause an inserting and retracting movement of the core relative to the casting cavity.

3. In a casting apparatus, a base, a mold part mounted thereon having a casting cavity, an apertured core reciprocably mounted Within the cavity, a lever extending laterally through the aperture in the core with one end fulcrumed Within the base at one side of the core, and fluid operated means operatively connected to the opposite end of the lever for moving the lever about its fulcrum to cause an inserting and retracting movement. of the core relative to the casting cavity. ,7

In Witness whereof, We hereunto subscribe our names this 31st day of January, A, D.

ALBERT P. ROSANDER. FRANCIS P. TIKALSKY. 

